Noise reduction in the playback of recorded sound

A method of noise reduction wherein two versions (10, 16) of the same original signal, for example of a recording, are simultaneously processed, one being supplied to a digital filter (18) and the other to a delay (12). The difference between the filtered input and delayed input gives an error signa...

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Bibliographische Detailangaben
1. Verfasser:	RAYNER, PETER JOHN WYNN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS RESONATORS TRANSMISSION
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Beschreibung
Zusammenfassung:	A method of noise reduction wherein two versions (10, 16) of the same original signal, for example of a recording, are simultaneously processed, one being supplied to a digital filter (18) and the other to a delay (12). The difference between the filtered input and delayed input gives an error signal, and the error signal is processed by a microprocessor programmed with an adaptive algorithm and fed back to vary the characteristics of the filter in such a manner as to reduce the error signal to a minimum, whereupon the digital filter provides the enhanced signal.